a group of friends go to the liquor store to buy some beers unfortunately 2 parties of the group run into a friend & stop to discuss a personal matter. That person is accompanied by 3 other parties total of 4 & the discussion turns into a fight. 1 of the 2 parties that were on there way to buy beer is now knocked unconscious & leaving the other party to fend for himself against 4 others w body/builds of 6' " & min 180lbs. 1man is down & the 2nd has a knife in his face, somehow he manages to take the knife as in fear for his life he proceeds to defend himself & stabs the guy w his own knife. The stabbing victim dies. It takes two months for an arrest to be made and the defendent is now being charged w murder-one PC187(a) first degree why not a lessor charge? What defense can be given???